source: ThirdParty/CodePatterns/src/CodePatterns/Observer/Zombie.hpp

/*
 * Zombie.hpp
 *
 *  Created on: Sep 5, 2013
 *      Author: heber
 */

#ifndef ZOMBIE_HPP_
#define ZOMBIE_HPP_

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "CodePatterns/Observer/Observable.hpp"

#include <boost/shared_ptr.hpp>

class Graveyard;

/** Zombie wraps an Observable and is allowed to set the graveyard.
 *
 */
class Zombie
{
  //!> only Graveyard may create zombies
  friend class Graveyard;

  typedef boost::shared_ptr<Zombie> ptr;
  friend class boost::shared_ptr<Zombie>;
private:
  /** Constructor of class Zombie.
   *
   * Is private to allow only Graveyard to instantiate them.
   *
   * \param _observable observable to wrap, ptr is NULL'd
   * \param _graveyard_informer callback when Observers are signOff()'ing
   */
  Zombie(
      Observable *& _observable,
      Observable::graveyard_informer_t *_graveyard_informer) :
    m_observable(_observable)
  {
    m_observable->setGraveyardInformer(_graveyard_informer);
    _observable =  NULL;
  }

  /** Returns the wrapped ptr.
   *
   * \param ptr to wrapped up Observable instance
   */
  const Observable * getPtr() const
  { return m_observable; }

public:
  /** Destructor of class Zombie.
   *
   * Is made public for convenience, to allow boost::shared_ptr access to it.
   * We could pass shared_ptr a befriended deleteFunction but this is overkill
   * as long as cstor is private.
   */
  virtual ~Zombie()
  { delete m_observable; m_observable = NULL; }

  size_t getNumberOfObservers() const
  { return  m_observable->getNumberOfObservers(); }

private:
  Observable *m_observable;
};

#endif /* ZOMBIE_HPP_ */